학술논문
The first direct observation of positronium hyperfine splitting.
Document Type
Article
Author
Source
Subject
*HYPERFINE interactions
*POSITRONIUM
*RADIATIVE transitions
*GYROTRONS
*NUCLEAR physics
*LIGHT sources
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Language
ISSN
0094-243X
Abstract
The direct transition from ortho-positronium to para-positronium with high-power sub-THz radiation has been observed with 5.1 σ significance. The observed transition rate is consistent with the theoretical calculation. A sub-THz gyrotron is used as the light source, and a quasi-optical Fabry-Perot cavity is utilized to accumulate the radiation. This is the first observation of the positronium hyperfine splitting (Ps-HFS), which leads to the first direct measurement of Ps-HFS with a target accuracy of 100 ppm in several years. [ABSTRACT FROM AUTHOR]